Joseph g



(No Model.)

J. C. LFPORD. NUT LOGK.

No. 431,252. Patented' July L 1890.

MNHN 1 111 1m WITHESSES:

' UNITED vrSgixlyrrzslJOSEPH e. oLIF'FoRn-or THE UNITEn sirATEsAR'Mv.

NuTLLook.

srncmcmron forming pmof Letters Patent nb. 431,252, dared July 1, Iseo. appresa and November zo, 1885'. smh Nol 183.433. (No man.)

.To all whom it may concern:

Be it known that 1, JOSEPH C. CLIFFORD, an offieerof the Ordnance Department,United States Army, and at present a resident'of the city. of Philadelphia, have invented certain new and useful Improvements" in Screws and Nuts, of which the following is a specification. The object of my invention is to furnish a f ready and eiiicient means of securing, in any desired position, nuts to bolts, tie,-rods,.axles, parts of locomotives, and ,railway-cars, parts of bridges, parts oivarious machines, and parts of gun-carriages, in such a manner that the nuts may not become loosened by jarring or.by any turning of the bolts or other parts" to which they are attached.

yFigure 1 represents a sideelevation of av bolt or screw embodying my invention. Fig. 2 represents a similar view of abolt or screw with nuts thereon. Fig. 3 represents a side elevation of a portion on an enlarged scale.` Fig. it represents an` end" View of the part shown in Figi'.v 3.

' Similar letters of referencesindicate corresponding parts in the several figures. V'The duplex screw isa screw chased with two threads, one right-hand and the other left- J said screw-fis elliptical in cross-section,

as is clearlysho'wn in the drawings.

The locking-nut is a nut in two parts a a,'

as shown in projection in Fig. 2 ofthe aecom- .panying drawings. These two parts, when separate, are ordinary nuts, one tapped with a righthand thread and the other with a lefthand thread. Th'e inner portion a has a bore larger in diameter than the outer portion a,

so as tobe more loosely fittedon the screw A4 When together upon solv threaded and the other left-threaded, substantially as described: i

2. A nut-lock consisting of a doublethreaded screw elliptical in cross-section, and a right and a left threaded nut, the inner of which is larger in its bore than the outer nut, substantially as and for the purpose set forth.

, J; e. CLIFFORD.

. Witnesses:

.- .IRA MACNUTT, 

